參數(shù)資料
型號: ISP1301
廠商: NXP Semiconductors N.V.
英文描述: Universal Serial Bus On-The-Go transceiver
中文描述: 通用串行總線在- The - Go的收發(fā)器
文件頁數(shù): 23/46頁
文件大?。?/td> 245K
代理商: ISP1301
Philips Semiconductors
ISP1301
USB OTG transceiver
Product data
Rev. 01 — 14 April 2004
23 of 46
9397 750 11355
Koninklijke Philips Electronics N.V. 2004. All rights reserved.
The Interrupt Latch register bit is cleared by writing logic 1 to its clear address.
11.3 Autoconnect
The Host Negotiation Protocol (HNP) in the OTG supplement specifies the following
sequence of events to transfer the role of the host from the A-device to the B-device:
1. The A-device puts the bus in the suspend state
2. The B-device simulates a disconnect by deasserting its DP pull-up
3. The A-device detects SE0 on the bus, and asserts its DP pull-up
4. The B-device detects that the DP line is HIGH, and takes the role of the host.
The OTG supplement specifies that the time between the B-device deasserting its DP
pull-up and the A-device asserting its pull-up must be less than 3 ms. For an A-device
with a slow interrupt response time, 3 ms may not be enough time to write an I
2
C-bus
command to the ISP1301 to assert the DP pull-up. An alternative method is for the
A-device transceiver to automatically assert the DP pull-up after detecting an SE0
from the B-device.
The sequence of events is as follows:
After finishing data transfers between the A-device and the B-device and before
suspending the bus, the A-device sends SOFs. The B-device receives these SOFs,
and does not transmit any packet back to the A-device. During this time, the A-device
sets the BDIS_ACON_EN bit in the ISP1301. This enables the ISP1301 to look for
SE0 whenever the A-device is not transmitting (that is, whenever the OE_N/INT_N
pin of the ISP1301 is not asserted). After the BDIS_ACON_EN bit is set, the A-device
stops transmitting SOFs and allows the bus to go to the idle state. If the B-device
disconnects, the bus goes to SE0, and the ISP1301 logic automatically turns on the
A-device pull-up.
相關(guān)PDF資料
PDF描述
ISP1301BS Universal Serial Bus On-The-Go transceiver
ISP1362 Single-chip Universal Serial Bus On-The-Go controller
ISP1362BD Single-chip Universal Serial Bus On-The-Go controller
ISP1362EE Single-chip Universal Serial Bus On-The-Go controller
ISP1501 Hi-Speed Universal Serial Bus peripheral transceiver
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